tynt sux0r

http://dropsafe.crypticide.com/article/3343#comment-23746

The way Tynt works is fairly simple. They attach a listener to the browser’s copy event that creates a hidden div with your selected text + two line breaks + attribution + sponsorship and they select the new text using either setBaseAndExtent for Safari, selectNodeContents and addRange for FF/Opera, or moveToElementText and select for IE. The browser copies the new hijacked selection to your clipboard. The script then reselects the range of text you had selected originally to make it look as if nothing is going on behind the scenes — using Tamper Data or Firebug’s Net panel will easily tell another story though, as you’ll notice requests going out whenever you Ctrl+C.